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Sunday, August 12, 2012

Mars Rover Brain Transplant

Mars Rover Brain Transplant - NASA's Mars rover Curiosity will begin a "brain transplant" tomorrow (Aug. 11), a four-day operation that will bring a temporary halt to the robot's science activities.

Curiosity is getting a major update, switching over from software optimized for entry, descent and landing to programs designed to help the robot roam and study Red Planet rocks and soil, mission team members said.

The transition will involve both Curiosity's main and backup computers, and it should take four Martian days — or Sols, in mission lingo — to complete.

"This is primarily an engineering activity," Curiosity lead flight software engineer Ben Cichy, of NASA's Jet Propulsion Laboratory in Pasadena, Calif., told reporters today (Aug. 10). "So we are mostly focusing on just getting done with the engineering and doing the installation, and standing down on science for the next four Sols."

Curiosity, the centerpiece of NASA's $2.5 billion Mars Science Laboratory mission (MSL), touched down inside the Red Planet's huge Gale Crater late Sunday night (Aug. 5). It pulled off an unprecedented landing, during which a rocket-powered sky crane lowered the 1-ton rover to the surface on cables.

The MSL team calls the flight software that guided this daring touchdown R9. With Curiosity now safely on the surface, it's time to switch over to R10, which was uploaded during the rover's eight-month interplanetary cruise.

R10 will allow Curiosity to get the full use out of its 10 science instruments and its 7-foot-long (2.1 meters), drill-equipped robotic arm, Cichy said. And the software upgrade will let the six-wheeled robot roam — more or less autonomously, if its handlers wish — around the Gale Crater area.

"Curiosity was born to drive," Cichy said. "The R10 software includes the capability for Curiosity to really get out and stretch her wheels on the surface of Mars."

Software upgrades like this one are necessary in part because Curiosity's computing power is relatively low compared with what we're used to on Earth, a consequence of the tradeoffs required to toughen the rover up for the rigors of launch, flight, landing and Mars surface operations.

For example, Curiosity's two processors — one each in its main and backup computers — run at 133 megahertz, Cichy said. That's about 10 times slower than the processors found in typical smartphones. And the rover has about 4 gigabytes of storage capacity, compared with 64 gigs or so for a smartphone.

Transitioning to R10 frees up this limited computing power by taking the landing package out of the mix.

"It's like closing a few applications on your computer, and 'Wow, the whole thing runs faster, and now I can drive,'" Cichy said.

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